Graphical user interface for a display screen or a portion thereof



The FIGURE is a front view of a graphical user interface for a display screen or a portion thereof showing the new design.

The broken line showing of the display screen and the broken line showings of text and portions of the user interface are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a graphical user interface for a display screen or a portion thereof, as shown and described. 